package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.mysql.cj.log.Log;
import com.mysql.cj.util.StringUtils;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    /**
     * 库存释放
     * 库存自动解锁
     * 如果库存解锁失败 告诉服务器解锁失败
     * 1、库存自动解锁。
     * 下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁。
     */
    @RabbitHandler
    public void handleStockLockedRelease(StockLockedTo to, Message message, Channel channel) throws IOException {
        System.out.println("收到解锁库存的消息");
        StockDetailTo detail = to.getStockDetailTo();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据库关于这个订单的锁定库存信息。
        //有：证明库存锁定成功
        //解锁：订单情况
        //1、没有这个订单：必须解锁
        //2、有这个订单：不是解锁库存。
        //    订单状态
        //            已取消：解锁库存
        //            没取消：不能解锁
        //没有：库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); //根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data == null || data.getStatus() == 4){
                    //订单不存在 or 取消状态  解锁库存
                    unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
                }
            }else {
                //消息拒绝以后重新放到队列里面，让别人继续消费解锁
                channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
            }

        }else {
            //无需解锁
            channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
        }


    }

    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId){

        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存工作单状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//已解锁
        orderTaskDetailService.updateById(entity);

    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();

        String skuId = (String) params.get("skuId");
        if(!StringUtils.isNullOrEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if(!StringUtils.isNullOrEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {

        //判断没有库存记录 则新增操作
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //todo 远程查询sku名字 如果失败 整个事物不需要回滚 try...catch
            //todo  另外一个方法   高级部分
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }


            wareSkuDao.insert(skuEntity);

        }else{
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }


    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();

            //查询当前sku总库存量
            Long count = this.baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * 库存解锁的场景
     * 1)、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * 2)、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     * 之前锁定的库存就要自动解锁。
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单
         * 方便追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        taskEntity.setCreateTime(new Date());
        orderTaskService.save(taskEntity);


        //找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查修商品在哪个地方有库存
            List<Long>  wareId = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareId);
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        //锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                throw new NoStockException(skuId);
            }
            for(Long wareId : wareIds){
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1){
                    skuStocked = true;
                    //todo 告诉mq库存锁定成功

                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(),taskEntity.getId(),wareId,1);
                    orderTaskDetailService.save(entity);

                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    lockedTo.setStockDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);

                    break;
                }else {
                    //当前仓库锁失败了 尝试下一个仓库

                }
            }
            if (skuStocked == false){
                throw new NoStockException(skuId);
            }
        }

        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getStockDetailTo();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据库关于这个订单的锁定库存信息。
        //有：证明库存锁定成功
        //解锁：订单情况
        //1、没有这个订单：必须解锁
        //2、有这个订单：不是解锁库存。
        //    订单状态
        //            已取消：解锁库存
        //            没取消：不能解锁
        //没有：库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId(); //库存工作单id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); //根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data == null || data.getStatus() == 4){
                    //订单不存在 or 取消状态  解锁库存
                    if (byId.getLockStatus() == 1){
                        //当前库存工作单详情，状态1已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    }

                }
            }else {

                throw new RuntimeException("远程服务失败。。。");
            }

        }else {
            //无需解锁
        }
    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了。
    //导致卡顿的订单，永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id).eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities){
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num; //锁定多少件
        private List<Long> wareId;
    }


}











